* {
    padding: 0;
    margin: 0;
}
body, 
html {
    width: 100%;
    height: 100%;
}
body {
    flex-direction: column;
    header {
        height: 4.4rem;
        width: 41.4rem;
        line-height: 4.4rem;
        font-size: 1.8rem;
        background-color: #f8f8f8;
    }
    main {
        position: relative;
        overflow-y: scroll;
        width: 100%;
        background: url("../img/advertisement-bg.jpg") no-repeat;
        background-size: cover;
        background-position: center;
    }
}
.jump {
    position: absolute;
    top: 2.8rem;
    right: 1.4rem;
    padding: 1rem 0;
    width: 10.5rem;
    height: 4rem;
    line-height: 2rem;
    font-size: 1.4rem;
    border-radius: 2rem;
    background: #fff;
    .timer {
        width: 4.1rem;
        border-right: 1px solid #bbb;
    }
    .space {
        width: 0.1rem;
        height: 2.5rem;
        background: #d5d5d5;
    }
}
.text {
    position: absolute;
    bottom: 12.4rem;
    width: 100%;
    height: 6.4rem;  
    font-size: 4.8rem;
    color: #fff;
    font-weight: 700;
    animation: bounce 1s ;
}
@keyframes bounce {
    0% {
        bottom: 30rem;
        font-size: 0rem;
        color: rgba(255, 255, 255, 0);
    }
    90% {
        bottom: 10rem;
        font-size: 4.8rem;
        color: rgba(255, 255, 255, 1);
    }
    100% {
        bottom: 12.4rem;
        font-size: 4.8rem;
        color: rgba(255, 255, 255, 1);
    }
}